multiplayer

[latent heart]

All the functionality is right there,

[normal garden]

However, if you are expecting your player base to primarily host by listen server this would be useful

That's not the issue, I'm trying to avoid duplication

Is there some documentation out there on creating custom property specifiers?

for example, if you could have OnListenServerChange or something along those lines:

UPROPERTY(ReplicatedUsing = OnRep_TendiesUpdated, OnListenServerChange = OnRep_TendiesUpdated)
bool TendiesUpdated;

this would save you from having to have these OnRep calls all over the code base

[latent heart]

I wouldn't specify it twice.

I would add a flag that makes the OnRep be called in c++ too

[normal garden]

You're already executing the OnRep twice

What's worse?

[latent heart]

Read the second line!

[normal garden]

Can you explain what you mean?

by flag do you mean boolean?

[latent heart]

Yes.

UPROPERTY(OnRep=blah, CallOnRepInCPP)

[normal garden]

Is CallOnRepInCPP some custom property specifier you would create

or are you talking about creating a completely separate variable to manage the state

[latent heart]

If you wanted to not have to call it manually, then yeah.

[normal garden]

This is what I am asking lol, is there any documentation out there on how to write a property specifer

[latent heart]

Nope.

You'll have to find how to add it in the unreal header tool and then how that metadata is used in the engine.

[fathom aspen]

You are prolly doing that on client, and GameState hasn't replicated yet. Add a small delay before that to see if it does the trick

Correct

[still path]

That was it - thank you

[fathom aspen]

APlayerController::PawnLeavingGame destroys the Pawn. Override it and make it not.

[twilit sequoia]

@fathom aspen thank you, this is exactly what I needed to know

[fathom aspen]

What does this mean? AI controller controls NPCs, while PlayerController controls PCs

[twilit sequoia]

I mean, if the pawn is depossessed ,I want for an AI controller to possess it

[fathom aspen]

Yes, I see no issue in doing that

[twilit sequoia]

For example, a player in an MMO who doesn't log out (properly) and so has an avatar just standing in the world

OK

[winged badger]

there is no issue doing that if the Pawn knows how to execute all its actions, and the controllers just tell it what actions to execute, via input or behavior tree

if you put the Pawn specific logic in the Controller though, you're kinda screwed

[twilit sequoia]

True. Care needs to be taken that shared implementation isn't in one of the Controllers

[regal solar]

How many game sessions x5.large can handle at once? (Gamelift)

[bitter oriole]

Depends on your game

[graceful falcon]

Hey guys I got an problem where to server and the client are not in sync, I fire an event and then the server is getting called immediately but the client is getting called around a half a second later. Does anyone knows how to fix this?

Here are some screenshots

[unkempt tiger]

In fast array serialization, does marking the entire array dirty (when elements are removed) necessarily mean replicating the entire thing from scratch? Or is there still some deltaing happening in the background?

I'm trying to figure out how hard I should work to stay away from removals

[pallid mesa]

with removals you are safe with fast arrays

[chrome bay]

It always replicates deltas

Marking it dirty just means it'll do comparisons

[pallid mesa]

fastarray is a bit worse for netbroadcasttick

better for bandwidth

but meh

[chrome bay]

Depends tbh, TArray removal is faster if you remove from the end

FastArray has quite a large header size for changes

[pallid mesa]

we are speaking about bandwidth now?

[chrome bay]

yeah

[pallid mesa]

ah oki

yeah tarray is depends ™️

x'D

but if you decide to netserialize your whole array and ignore deltas

it'd be better for the cpu, worse for bandwidth

but deltas will be in consideration anyways

[unkempt tiger]

Awesome, thanks 💪 quickly gets rid of paranoid virtual removal code

[pallid mesa]

right, so random accesses with long arrays, fastarray better for bandwidth (in general)

short arrays... almost tarray wins always

[chrome bay]

yeah it really depends tbh, just have to make an educated decision on what one to use where

the more you know about how they work at the base level the easier it is to decide

[pallid mesa]

rule of thumbing this is really tricky................

but I guess with a series of rules and your budget needs you can decide

[chrome bay]

any fast array change for e.g. is a minimum 128 bits

[unkempt tiger]

when we say short, how short are we talking element count-ish?

[chrome bay]

• 32 bits for each altered or deleted index

also depends how well the items serialize etc. By default in 5.0 per-element delta serialization is done with FastArray now, but previously that wasn't the case

[pallid mesa]

depends aswell on the nature of your data

yeah what james said

[chrome bay]

So if you have an array of fixed size where only the elements are changing , TArray (or static array) is better

Certainly used to be the case anyway. The general answer is just "it depends" as always 😄

[unkempt tiger]

we should have an array type that ughmm yeah i dont know what im saying

[pallid mesa]

🤣

it's hard to tell

as Dev told me once, tools in your toolset, sometimes you can unscrew screws with the wrong screwdriver

profiling gives the solution for your use case always

[swift pulsar]

Hello, I'm trying to blend to Level Sequence camera in a multiplayer setup.
The Player Controller blends correctly and the sequence is played, but I'm not blended into the sequencer's Camera Actor, but in the Level Sequence Actor itself.

In the single player setup, setting the view target to the Level Sequence always automatically blends into the camera. It doesn't work like that in the multiplayer?

[grizzled stirrup]

I'm getting crashes when hosting a session then accepting an invite to another session. Is it essential to destroy any existing sessions before joining another?

[quartz iris]

How can I play an interface on the server?

[bitter oriole]

Define "play an interface"

[quartz iris]

I made a flashbang with an interface which makes the character get flashed with a widget

If the character is in the range of the flashbang

But it doesnt work for the server

only clients

However it spawns the projectile

Here's the spawning part of the code

[swift pulsar]

Why would you want to run it on the server, though? If it's just a widget and/or some VFX then it should only be called on the client(s).

[quartz iris]

Cus it doesnt work

[swift pulsar]

You need to initiate it on the server, but run it on the clients. For example with the "multicast" event.

[grizzled stirrup]

Where is this snippet being called from?

[swift pulsar]

Sth like this:

Or even better:

[quartz iris]

The flashbang itself

[grizzled stirrup]

Right so it's a separate projectile spawned on the server that then runs code when exploding?

[quartz iris]

Yeah

[grizzled stirrup]

Is this a dedicated server (pressing Run as Client) when playing or a listen server?

Have you tried seeing if the trace even runs?

Before thinking about the interface

[quartz iris]

Yes

It works every time in singelplayer

[grizzled stirrup]

No but have you verified via a log or whatever that it's getting as far as the interface func call on the server?

You can log for client and server separately to see

Important to nail down exactly how far it is getting on the server before assuming it's the interface

It may not be calling that entire chunk of logic

[graceful falcon]

Hey guys I got an problem where to server and the client are not in sync, I fire an event and then the server is getting called immediately but the client is getting called around a half a second later. Does anyone knows how to fix this?

here are some screenshots

[swift pulsar]

You cannot fix it, this is how it works. 🙂 You have to work around it.

A safe option is to use RepNotify variables: https://docs.unrealengine.com/4.27/en-US/Resources/ContentExamples/Networking/1_4/

[twilit radish]

Welcome to latency 😅

[pallid mesa]

the way to sync it is by sending a timestamp

basically

u do action locally, tell the server to do it with your timestamp

once the action arrives to the server

the server can know when you started issuing the action

the server can validate such action

if everything is nominal

it will proceed to fast forward the action to the point where it should be based on current time and timestamp

if a hazard is found the server issues a rollback to the client

[swift pulsar]

But sending a timestamp is possible only from a Net Owning Client, right?

[pallid mesa]

yes your local timestamp

usually you'd like to have a synced clock

in vanilla UE4 is getservertime

or sm on the likes in the gamestate

it's not very good

in fact I recommend implementing your own ntp clock

[swift pulsar]

NTP?

[pallid mesa]

network time protocol

[swift pulsar]

ok

[iron glacier]

Does anyone have any clue why a root motion anim montage would shake or glitch the animation without applying the movement? This only happens in multiplayer mode. The animations have enabled root motion and the animation bp is set to accept root motion from montage. Not sure what I am missing

[magic yoke]

Riddle me this batman:

I make 7 calls on my server to RPC on my client. I confirm that the call is going out to 7 different actor components. All actor components have the same owner and are the same class, created in a batch earlier. Only the first actor component runs the code, the rest do not. No message log errors indicating that the code hit an error

Am I missing something about how this should work?

event dispatcher allows you to make a single call that splits into multiple simultaneous events

should be what you need

[shell forum]

It would still be blocking so the UI and current level would freeze.

[magic yoke]

fuck it nevermind

I'm not 100% sure on the answer since I don't know how you're doing things and I'm no expert myself

disregard my info if it's not a simple answer like not knowing about event dispatchers

[grizzled stirrup]

Late joining clients will automatically call all OnRep functions that differ from the default values of OnRep variables, correct?

[lone steeple]

Hello, I'm currently implementing a system to add niagara particles to any item I can pick up. I also want to make any upgraded sword or similar have particles as well.

So far, I've gotten to the point where the server spawns the particle systems, but I still gotta get it to the client, which brings me to my question...

I'd assume these weapon particles are spawned on the server then I need to somewhere have a multicast event which spawns them on the client?

I'm still quite clueless on how these systems are implemented in multiplayer. Any guidance or advice would be greatly appreciated!

[grizzled stirrup]

Just have a niagara component on the pickup actor itself and have it activate the particles on both client and server when spawned

No need for any replication here

[graceful falcon]

Hi thanks for your response, I just tried using a repnotify it still doesnt work.

[neon atlas]

Where do you add new players and lookup to check if they've been on before? GameState? GameMode? On the player, when the player calls begin play?

[silent valley]

I'm not at my computer but Game mode I think. Search for Login in the header there's some useful functions to override.

[lone steeple]

I don't think that works for me. I might be understanding this wrong, but the controller doesn't necessarily own the items that are on the ground.

Yeah, I just tested it by getting ownership during runtime and the moment the playercontroller is the owner of the item that's on the ground, then it works, but also only for that particular client. So, I need the server to distribute the particle systems I guess?

[grizzled stirrup]

Ownership doesn't matter in this case. A pickup is its own thing (regardless of owner) and FX exists on THAT

So if the pickup actor is replicated and you activate the FX on BeginPlay, it'll play on both client and server without having to specifically call a multicast RPC or whatever

[lone steeple]

but it doesn't work, so somethings not right

[grizzled stirrup]

Ok so you have a pickup actor and on beginplay you are spawning the FX right?

In that case if the pickup actor is replicated, both server and client will see the FX playing

[lone steeple]

I implemented a very complex system from an ARPG plugin that does a bunch of things, so it's a bit hard to pinpoint stuff

[grizzled stirrup]

I'm still quite clueless on how these systems are implemented in multiplayer. and I implemented a very complex system from an ARPG plugin that does a bunch of things don't get along great: I suggest simple examples to learn how things work

[devout berry]

I know this is under NDA mostly, but how do people test online multiplayer on consoles before release?
I get that you can use steam etc. for pc, but otherwise I would need 2 devkits then or what is the common approach?

[grizzled stirrup]

You get dummy accounts that you can use

And yes you'd need 2 dev kits

[devout berry]

But for devkits

yeah exactly. Ok thanks

[lone steeple]

Basically, I have a BP_MainPickupClass which has a BP_PickupComponent as well as a BP_ParticleService (which is also an actor component). The pickup one handles setting which system to spawn and where, the ParticleService takes those two variables and spawns on Server.

At BeginPlay in the BP_MainPickupClass calls a custom event called initialize within the BP_PickupComponent which down the line calls an event called setParticleSystem which sets which systems and location. This same function calls an event in the BP_ParticleService with those variables as input. That event is the Server_SpawnParticleSystem (On Server). This is hard to explain, does that make sense tho? @grizzled stirrup

[grizzled stirrup]

Ok if you are initing data on the server then yes it'll need to replicate down to clients either as an OnRep variable (a custom struct if initing pickup data) or as a multicast RPC for one off FX

I personally have a system where I have a DataAsset per pickup type that gets replicated down as part of a struct with a few other properties like Cost and such that gets calculated at runtime

So you can then activate the FX on the client when that struct OnRep function calls

[lone steeple]

I have that replicated variable, but not sure what to do with it

OnRep it just does this again

This system is almost the exact same from how the plugin set it up

[lone steeple]

Is there a different variable that I'd need to RepNotify or is that RepParticleSystems variable what I'm looking for?

[grizzled stirrup]

Honestly I'm not sure this does seem like a very complicated setup

In general the GameplayAbility stuff is just very convuluted in my opinion

I would just have a simple pickup that gets initialized by a simple struct, that structs replicates down via an OnRep variable

[lone steeple]

I mostly tried to implement it as practice to figure out how this stuff works properly. I've never worked with structures or datatables before so I already learnt a ton, it's just this last bit that doesn't quite make sense to me on how to tackle it.

[grizzled stirrup]

It looks clean from what you've done but when that struct replicates you then set another struct

When does the FX actually trigger?

[lone steeple]

Here I guess

That server event near the end

[grizzled stirrup]

Right but it seems SetParticleSystem is only called on the server at begin play is that correct?

[lone steeple]

Gonna check real quick

[grizzled stirrup]

So the client would never call it when it receives RepParticleSystems as BeginPlay has already fired

[lone steeple]

Barely fits lol

[grizzled stirrup]

Ok so yeah the client will never call SetParticleSystem as far as I can see

Because stuff will replicate down after it has already been called most likely

[lone steeple]

Hmm, sounds like that could be whats causing it, but no clue how to fix it tbh

[grizzled stirrup]

Simply call SetParticleSystem in the OnRep func

[lone steeple]

In here?

[grizzled stirrup]

Yes! Particles have replicated down on the client, the client knows what to play, play the FX!

[lone steeple]

I added it, but hasn't changed anything as far as I can tell. It might be the way I set up the events in the particleservice.

I was trying some stuff out, gimme a sec

[grizzled stirrup]

Oh right because you aren't actually playing the FX in that function, you are calling a server RPC to call them

Basically it boils down to client recieves OnRep variable with particle info, plays the particles locally

Also you'd want to be calling that AFTER you set the struct and replicated var if that struct you are setting is used within the play FX function

[lone steeple]

Changed it

Idk if this helps, I tried a few different arrangements non worked lol

This part with the whole RPC stuff, I just can't wrap my head around it, it seems 😄

Do I need to add a repnotify variable here maybe?

[grizzled stirrup]

In theory what is happening here is the client is telling the server to then go back and tell the client to spawn a particle system at a specific location

Unless something else is calling the server RPC?

Client RPCs are only called on the owning client

So if you want ALL players to see it or if the client doesn't own this actor, then use a multicast RPC

[lone steeple]

The server_spawn function is only called in the setparticlesystem function

[grizzled stirrup]

Ok so the pickup itself doesn't need to call a server RPC if it's happening at begin play

Begin play fires on both client and server so you can use the Switch has authority node to filter between server and client

That cancels out the need for the server RPC

however if the client does not own this actor, the client RPC will do nothing

[grizzled stirrup]

However... it looks like it's actually a multicast RPC as it says replicated to ALL

So you named it Client but it is a multicast

[lone steeple]

Would be so nice if I could jump over this hurdle today which would finish this system implementation for now. Spent 15 hours on the whole thing today and want to finish it lol

[grizzled stirrup]

I would heavily suggest working on a simpler example just to get comfortable with what gets called where, it seems you have a complicated setup but aren't quite sure how it works

[lone steeple]

Yeah, would definitely be smart, but I usually bruteforce my way through things like this. At first I had no clue how this particular system worked, but now I get it mostly. Just took a lot of effort and now I can very comfortably add any kind of particle system to any of the pickups (and hopefully the equipment soon as well)

Just this last bit is halting progress

Hmm, basically the issue right now is that I'm not able to see anything if the client doesn't own the pickup item.

Which usually works if you multicast right?

[quartz iris]

How should I be storing whether a weapon skin is unlocked/locked

[pallid mesa]

your server should be concious of the progress of all of your players

so can do through a DB, or through a save

[elfin sail]

keyboard input is not working on client

any idea

player movement is working fine offline but when it connects to server there is input at all

[dark edge]

Show your setup

[frosty remnant]

Should I read this as "runs on client ONLY" or as "runs on both server and owning client"?

[obtuse field]

This is a function that you are calling from the server and its running on the client that owns the actor, it doesn't execute on the server

[dark edge]

Server triggers it, client that owns the actor runs it.

[magic yoke]

@dark edge
Dr. Evil — Today at 1:11 PM
Riddle me this batman:

I make 7 calls on my server to RPC on my client. I confirm that the call is going out to 7 different actor components. All actor components have the same owner and are the same class, created in a batch earlier. The call is made inside an actor (player state) that is owned by the client. Only the first actor component runs the code, the rest do not. No message log errors indicating that the code hit an error

Am I missing something about how this should work?

[dark edge]

Show your setup

[magic yoke]

rgr. one moment

[magic yoke]

the print leading to the call is printed 9 times

but the client only runs to code directed at it for the first instance

(each call is made on a separate object)

[dark edge]

What happens if you make it reliable?

This sounds like a weird approach to whatever you're doing. Why can't you just do one RPC?

This sounds like it should be a RepNotify, how big are the chunk struct arrays?

[shell forum]

Will EventActorBeginOverlap fire on all clients no matter how far away they are? Or should you use a multicast for it?

[obtuse field]

Is it still possible to create a replicated UObject in UE4.27? I tried to follow this tutorial:
https://jambax.co.uk/replicating-uobjects/
But it doesn't work for me. I want to call an UObject's RPC and its dropped, the function is not executed on client, nor server

[dark edge]

That will fire if the actor exists. On some clients, it'll be out of relevency range.

[shell forum]

What's best practice for begin overlap causing destruction of certain actor's components?

Would it be a simple mutlicast -> destroy component

or a rep notify with a variable to disable it?

[dark edge]

If the component is replicated just destroy it

[shell forum]

Doesn't seem to work. I'm turning off a light in an actor.

Hold on, let me set the actor to replicate.

Ok, so destroying components works but changing materials doesn't, even with replicates component. Is this how it's intended to work?

[dark edge]

Material isn't automagically replicated, just replicate some thing that drives the material. What are you trying to do, just turn a light on and off?

[graceful flame]

Use repnotify for that

[shell forum]

Yes, destroying the light component is working perfectly. I'm using multicast to change the material and play a sound.

[dark edge]

Then how do you turn it on? Don't destroy the component, just turn it off.

What's the actual mechanic you're trying to do? This sounds like it could just be driven by a repnotify on a bool...

[shell forum]

No need to.

[shell forum]

Lights turn off as soon as a pawn steps into a triggerbox

fire and forget is fine, no need to turn it back on

as well as changing the lamp's material to off and playing a sound.

[dark edge]

Just make a variable bIsActivated, repnotify on it, and do all 3 of those things at once when it changes.

don't even need to replicated the components then.

[shell forum]

The logic is working btw.

[graceful flame]

If you want to optimize it further you can replace the cast to Smiler_BP with a check for a tag instead. Actor Has Tag “YourTagHere”, true / false. @shell forum

[shell forum]

Are tags really faster than cast to?

[graceful flame]

Casting keeps the objects in memory

So it’s not like a faster vs slower thing it’s like how much complexity your game can have at any point in time

[shell forum]

Got it, will do.

[shell forum]

Which object does it keep in memory? Only the successfully casted one or all of them?

[graceful flame]

The thing you successfully casted to AND all of the things it references too.

[shell forum]

I might add some functionality like playing an animation with the pawn that walked there so will leave it for now.

[graceful flame]

So for instance in my game I have a few different parent character classes with even more child classes underneath them. Instead of casting them which would be expensive for memory I use tags.

The downside to using tags is that they are prone to human errors with typos and can be frustrating when debugging. You have to make sure that you spell the tag exactly the same when checking for it. They’re also case sensitive I believe.

[fathom aspen]

Correct

[shell forum]

My game currently doesn’t have players joining in late for any functionality. Would using a multi cast still apply changes to actors out of the range of clients?

[fathom aspen]

Nope. Multicasts don't count for out of range clients as well as for late joiners. They should only be used for non-stateful events, aka transient events.

See first pinned message. The blog explains it very well.

[dark edge]

@shell forumYou should prefer RepNotify when it makes sense, it's really elegant and robust.

Depends on if it's a state or not

if it's stateful, the variable isn't useless

[fathom aspen]

Use a bitmask then

[dark edge]

I mean how many states does your thing really have?

[fathom aspen]

That does not justify not using them. Their use is just inevitable.

[winged badger]

if this is in blueprint, you don't really have a replication callback there, its a property changed callback masquerading as one

so if a client sets a value on RepNotify variable, OnRep will trigger

blueprint OnReps will trigger on any value change

no matter if it was made through replication, or if the client set the value locally

[fathom aspen]

Also as Adriel told you, try to replicate the thing that drives the action, not the action itself

That can save you bandwith

There's nothing special about RepNotifys really. You set the value on server and you get notified of the new value on both server and clients(in cpp it's only on clients)

[devout edge]

Sorry if this doesn't make sense bur doez anybody have any advice about learning how to optimize data transmission for better multiplayer performance? Complete beginner. I know data types have different sizes but confused how this works in practice. Does this apply only to the parameter data types passed in to functions, or also how these are used in the receiving end?

[fierce oriole]

Omg someone please help! Im trying to Spawn Sound Attached on an Actor in the Level, but no matter what it will not spawn. I've tried events as Server, Multi, Owning and no Replication. Is there something I'm missing for in level actors?

[elfin sail]

Fixed Actually I did not set Input mode

[plucky prawn]

What in the world have you assaulted my eyes with?

[glossy kettle]

ikr

[thin stratus]

Sequences are replicated, yes

Even quite okayish

[shy nymph]

Hey guys, what would be the proper way for the server to move a client? I have a vault system where the server sets actor location in a lerp towards the target location but the client receiving the location updates is very stuttery

[fierce oriole]

Hey I was running experiments lol

[fierce oriole]

Either way I got it figured out lol

[lone steeple]

Sounds like it might be good to have a local character that requests from the server if it is allowed to do the action, then the server runs it and also triggers the action on the local character. So, two things are basically happening.

1. The server checks if the client is allowed to do the action, then does the action on server and tells the local character if it can do that action.

2. The local character requests to do the action and on request granted it performs the action locally with smooth client side movement.

I'm a noob at multiplayer so I could be way off, please feel free to correct me if any of this is wrong! 😄

[winged badger]

gameplay task component with root motion animation

[shy nymph]

that is basically what it is right now just the act of "allowing" it i am not sure of, because moving the actor (player) locally the character movement component always works against it

which is why i am lerping the character location on the server to let the server have authority over the players location

i guess all i need to do is to start the same lerp on the client instead of waiting for the server updates to get smooth movement - I was just wondering if that was the correct way of handeling it or if there is like a "CharacterMoveTo" function that then takes care of the client side movement natively with the character movement component before I implement it myself

[shy nymph]

due to the way our setup works we do not want to work with root motion animation - we want the code side (distances, speed, possible heights etc) to be solved in code instead of the anim

[winged badger]

distance and height would be code driven

root motion often is, it can take a float curve for height during the animation, for example

we use that method for jetpack jumps

[shy nymph]

oh okay that sounds fair then, is there any references you could recommend to get into?

[winged badger]

i did not write it, so i can't tell you much off the top of my head

but it handles predicted movement well

no jitter involved

[shy nymph]

it's always one thing to have it solved generally but multiplayer always makes it harder and rarly a tutorial covers that part ^^

[winged badger]

for documentation on this, i'd dig into GAS

you don't need to use GAS to use GameplayTasks, but GAS does use them extensively

[shy nymph]

thanks - I'll dig into this to start out with then 🙂
https://www.youtube.com/watch?v=YvXvWa6vbAA

[livid arrow]

anyone have a method to using "Launch Character" in multiplayer? ive seen online in old forums that it doesnt work and it seems to still not work with multiplayer is ue5

any tips?

[vivid prawn]

is there anyway that I can track how much data server is getting/sending or in another word how expensive is networking in every session?

[winged badger]

there is a net profiler that comes with unreal

[magic yoke]

sorry I conked out, I've done it via rep-notify before, but I'm redoing it and decided to try not doing it rep notify

I don't mind re-working it to be rep notify at all, I'm just curious what's happening because for sure there's seems to be a "rule" happening here

chunks are right now 100 structs with a vector and a string in them

you are right that checking it as reliable causes it to work properly

[chrome bay]

Until somebody joins late

Persistent state should always be driven by replicated properties

[magic yoke]

if you're talking to me, this is client side display

so that's not super important

I'm horribly abusing the unreal engine to make a tile based game

replicating the actors isn't viable with the numbers involved, so the server provides a struct that tells the client what it needs to display on each tile

in the past I did it via repnotify for the 100 struct array

but I was trying to see if I could refine that so I'm not updating 100tiles every time a single tile changes

honestly, probably over-optimizing

and it's definitely something I can do post-prototyping if it's an issue

but!

I learned something about RPCs and reliability :)

[chrome bay]

You wouldn't replicate 100 tiles everytime it changes anyway, arrays and structs only replicate their changes, not the full array

The problem with RPC's is if the client doesn't have that actor when you send them, you'll never see the changes

[neon atlas]

Looking at the GameSession code, it seems that BanPlayer, simply kicks the player?
Any googling tells me that it still doesn't actually ban a player, I thought I would ask here, just to confirm?

And if it's the case, does anyone have a proper way to ban a player?
Or would the solution simply be, to use PostLogin or something, to identify the player, and if they exist in the ban list, to kick them again?

[magic yoke]

ok, that's pretty reassuring, however is there any way to know what the changes are? If I have 100 structs in an array and a single struct is changed, is there a way I can know which struct was that changed? I'm not sure how rough running the setup code for 100 tiles would be if I did it every time a change was made, without having fully planned out that far I'm not sure if small frequent changes to the array would cause issues client side in that sense.

I can plan to do batches instead of smaller updates where possible, but it'd be nice to know how much flexibility I do/don't have

[magic yoke]

That's not an issue for what I'm doing here at least, these are actors that are created on startup immediately. Without them you'd see a blank skybox. The client tells the server when it needs to update the display based on where it is in the world. The issue is the scale of possibly displayed things goes well past the point where actors start to butcher performance, my tests are on 10,000 tiles so far. So the persistent state is the structs that tell the visual tiles what to represent. In a sense I'm re-coding relevancy to a degree because of the actor performance issues.

So long as I wait for the player to properly log in, those actors have to exist or everything is already fuxxed lol. Definitely keeping that in mind going forward though.

[chrome bay]

In Blueprint no - but in C++ you can use a RepNotify and compare with the previous sate, or you can use an FFastArraySerializer which has per-item callbacks.

[magic yoke]

ok, I'll file that away for the future :) I'm trying to take this as far as possible with blueprints. Injury makes typing code for long times start to cause a lot of pain, I find blueprints easier to work with.

but now I know there's a C++ backup I can go to if I really need the performance

anyway, awesome help @chrome bay, super appreciate it!

[sage isle]

So how do you go about saving information for a dedicated server, like so the player logs out and back in they are still in the same place with the same stats and stuff and not just starting over again. I know there is the saved game object but for multiplayer I am not sure where to start saving that kind of info.

[magic yoke]

you'd store the relevant information in an actor component (probably a game state child?) and add code so when a player logs in they have an ID that lets you know which stored component represents them. Super unsafe way to do that would be a String map that ties player name to their actor component.

Then you load their location/stats/etc from said component. If they don't have an object saved under their ID, make one and start them off from scratch

[sage isle]

Hadn't considered using their ID's to get it like that, I've got their ID's stored so thats not a bad way of going about it, thanks!

[magic yoke]

good luck :)

[sage isle]

One more thing, if I were to store it that way, would the info be saved if the server were to shut down for any reason? Like is game state persistent even if it goes offline?

[quasi tide]

I don't see why you wouldn't use the save game object. Just need to have some unique identifier.

Login - server checks if that save game exists, if it does, loads it and sends that information to the player.
Logout - server creates the save game with the relevant information.

[half umbra]

How can i set for attached weapon "Only Owner See", on client it works, but when server pick up weapon then client see this weapon

[magic yoke]

I mean, if you set it up to save properly, just like you would save for a single player game.

[half umbra]

I want hide weapon for others players

I want only owner see

[chrome bay]

You make them the owner

It's based on Owner, not what it's attached to

[half umbra]

So, how it should looks like?

[fluid horizon]

If I were to assign a UUID to every new player, and that UUID will save to lets say your steam account, how would I go about that?

[dark edge]

Why not just use the Steam ID?

[fluid horizon]

U can do that?

Oh lol

That makes it 205x easier

[fluid horizon]

But lets say I wasn’t using steam sessions, what would I do

Idk if ima get a steam app cuz its $100 and like breh

[winged badger]

game using steam uses the steam ID as unique net ID

in the playerstate, by default

[fluid horizon]

Yeah but what would I do if I wasn’t usibg steam

[winged badger]

other services have other ways ot determining what unique net ID is

[fluid horizon]

Wb a custom one

Like blueprint sessions

[winged badger]

and if you don't have at least 20-30 people in studio, you do not want to even consider crossplay

[fluid horizon]

True

Do u know any other service there are other than steam

One that doesn’t cost $100 lol

[winged badger]

eos might not cost you

it has its own channel #epic-online-services

[fluid horizon]

I’ll check it out, thanks

[dark edge]

How true is that for the simplest of online functionality? Nothing crazy, just joining friends? Does it really get into the weeds if you use EOS as backend?

[winged badger]

the console folks are really fidgety about keeping their standards

and when you patch anything it has to pass their QA for every console

and you have to time all patches for all platforms together

its a real pain in the arse

[dark edge]

Would PC first with EOS be a good foundation? I realize console is a stretch but I'd like to keep the possibility open in the future.

[winged badger]

epic store requires crossplay on PC to work iirc

but not consoles

which is a far shorter order

[dark edge]

If we do console at all I'd want crossplay as default, I'm a big fan of crossplay and would rather not release on consoles than have a fractured population. This is all spitballing, it's one of them good problems to have.

[winged badger]

our console release will (hopefully) be 18 months after the steam release

[dark edge]

https://tenor.com/view/senator-palpatine-anakin-skywalker-phantom-menace-gif-10607636

[pulsar river]

how do i ensure that a replicated variable is replicated down to a new client, before the new client's actor calls its begin play?
example)
client1/server change a ball from red->blue
client2 joins the new server and on the balls begin play updates itself using a replicated variable "color"
client2's ball doesn't change color

[winged badger]

it always does

when client receives instructions to spawn a replicated actor

it first spawns the actor, then sets the replicated variables that are sent in the game package, then calls OnReps, then PostNetInit, then BeginPlay

[pulsar river]

i see okay maybe im doing something wrong then ty @winged badger

[winged badger]

i am not entirely sure that applies for replicated variables in ActorComponents, or in Bleuprints

as Blueprints don't have a replication callback

[pulsar river]

C++ does?

[winged badger]

it does, in Blueprint they masquerade the PropertyChangedEvent as RepNotify

you can easily test it by setting a value of replicated variable locally on client and then watching its OnRep fire

[dark edge]

Is PropertyChangedEvent a first-class thing or just some BP hackery?

[winged badger]

it uses IPropertyChangedTracker i think

and it is a 100% BP hackery

[dark edge]

aww we don't have an automagic property changed listener in C++?

[devout berry]

Isn't event handle starting new player also supposed to be called after a seamless server travel?

I kind of only get the event fire for 1 out of 2 travelers (I believe its the server )

[winged badger]

it is, and it does

[devout berry]

Hm

[glad escarp]

Hey all. Quick noob question. If I have a lobby-specific player controller, when I do server travel and load a new level, if that level has a different default player controller, will it switch over or will this cause issues?

[azure hull]

Is it expected that movement should be always reliable or not?

[dark edge]

Depends on what you mean by "movement"

movement input shouldn't be reliable, you're sending it constantly

[azure hull]

Basic movement, movement like dodge etc.. But alright got it, though so, still learning.

[fluid horizon]

I need some help, clients are jittering so much but it is replicated correctly, bcuz its the default character replication

[dark edge]

We need way more information than that. What are you trying to do, are you doing anything outside of walking around and jumping?

[fluid horizon]

Yes

Its a true first person camera

It’s probably something to do with that

[graceful flame]

Are you doing any sort of wall running or dodge or dash?

If so you'll probably need to extend the character movement component to use compressed flags over the network.

@fluid horizon

[fluid horizon]

Nah

[graceful flame]

Are you simulating some network lag and or packet loss?

[dark edge]

@fluid horizonWhat about sprinting? Are you doing anything movement-wise that's not just a change in the default numbers on the CMC?

[chrome quest]

If you try to sprint by simply changing maxwalkspeed, you'd get that behaviour.
You have to do some cpp stuff in the character movement component to get proper replicated sprinting.

[toxic lion]

you don't need to do that in cpp. you can easily just do it in BP
Set sprint speed on the client, and on the server

[chrome quest]

Technically yes. But it tends to fall apart on high ping.
I've experienced it before and I had to use cpp. There was movement lag on high pings but I wasn't rubberbanding

[graceful flame]

Always test multiplayer with at least some simulated lag and packet loss. Otherwise you're just lying to yourself.

[toxic lion]

That doesn't really make sense to me. The movement speed is set on one frame, not continuously.

[hollow eagle]

Nope, it's set on one frame on the client and a completely different frame on the server.

Which results in at least some amount of time where the client thinks it should be moving faster than the server allows.

The solution to that is to either:

• not set speed predictively (ie wait for server response), but this results in input lag
• use saved moves (or a similar system) to reconcile client prediction with the server.

[graceful flame]

Additionally, running your game with simulated lag and packet loss will expose these kinds of issues if you opt for a blueprint only approach.

[toxic lion]

but that would still resolve itself in a matter of a few ms in most cases wouldn't it?

they're saying that the client is jittery is likely an ongoing problem because they haven't set the max walk speed on the client & on the server

[graceful flame]

I have mine set to 72min and 150max with 1% packet loss for both incoming and outgoing traffic. You can configure this via Editor Preferences ---> (search for network) then look for the Multiplayer Options and Enable Network Emulation.

[toxic lion]

thanks for the input here. I'm going to have to test this out myself

[graceful flame]

If you have jitter without simulated lag, its gonna be much worse with a little bit of simulated lag

You can also use p.NetShowCorrections 1 in the console to have it draw whenever there's a network correction. Ideally when simulating lag you want there to be nothing drawn, but a little bit here and there isn't so bad. If you see lots of blue capsules something is wrong.

[fluid horizon]

Nope, just normal movement

[unkempt tiger]

Any way to prevent the stand alone server console from closing immediately after spurting out very useful red errors that I want to read?

[regal geyser]

I'm using simple On Component Begin Overlap and it triggers on all clients while I can't see option to turn it to run on server only so the client don't have to bother with this event, how can I do so? (Each client have capsule overlap collider in its Blueprint)

[fathom aspen]

SwitchHasAuthority right after OnComponentBeginOverlap and use Authoirty pin

[fathom aspen]

Launch with -log flag

[shell forum]

Is SwitchHasAuthority done locally or is there a network call? Is it lightweight enough to call many times without trying to be conservative with it?

[fluid horizon]

basically, I'm using a thirdpersoncharacter but made it true first person, its prob something to do with that

The camera follows the character animation

I chose head as the parent socket, and it only jitters when im walking backwards

[fathom aspen]

Yes. It's a macro that calls HasAuthority() which is a one liner function really

[regal geyser]

I knew about that but the problem is that I would like to make client completely ignore this event, because it will literally just get blank triggered for no reason at all

[fathom aspen]

You would need to modify the source code to do such a thing. And if you do it, it might break some engine functionality down the line

It's a micro optimization really

[plucky prawn]

does RPC work with return values? like if i have a Server RPC that returns some type and call it on the client, will the client get the proper return value? or will it just be the default of the return type?

[latent heart]

Rpcs can't have return values.

If you wanna return a value you need to call a second rpc to send the response back.

[plucky prawn]

oh thanks i didnt know this

[pallid mesa]

it's an if, so no rpc's implied

[winged badger]

it just reads the Role from the Actor

note that client has Authority over Actors it spawned itself

so do not confuse HasAuthority for IsServer

its not the same

[winged badger]

not really a #multiplayer issue, and definitely not the best channel to ask

probably, but i have no idea how

i mean you can get code to compile for server only with #if UE_SERVER

no

but i would use the preprocessor diurective in c++

to instantiate a blueprint with server only code only on server

and i wouldn't even package it on clients

so you get the same effect

not sure if UE_SERVER is correct, but its something to that effect

your intellisense will probably figure that out

you can also use GameMode, as clients won't really have that one

but you would need to package the server only blueprint code that way

[azure hull]

Could anyone tell me, why if I use PlayMontage, I need to pass it through RunOnServer and Multicast, but if reguar animation is used through StateMachine, only RunOnServer is needed (Multicast is not required)?
Is there something under that I'm missing or some kind of integration by building project out of Template?

[regal geyser]

I'm so confused, each player has a cylinder overlap collision around him and when other player enters it, this player will be added to the array. But why on client its adding itself to this array?

Also when I use branch so that Other actor is not equal to self reference it won't add anybody to this array, what I can't understand

[winged badger]

its a component collision, Actors don't have a form or location if not from their components

if your collider can trigger an overlap with another component on the same Actor, it will

[twin juniper]

hello guys

can i use EOS to host my game?

it have any dedicated servers

?

[twilit radish]

Probably would fit better in #epic-online-services , but the answer is no. EOS does not host dedicated servers for you, that would be an insane large cost for them. Unless you're referring to perhaps matchmaking / server discoverability. Then maybe? I see some resources about EOS + Dedicated Servers but can't quite figure it out quickly.

[lament garnet]

is it normal that if i add even something like 30 to pkg lag command my attack traces just dont work or they work very poorly?

should i execute the traces on clients? how can i trust client traces tho?

[winged badger]

if you don't, any FPS game will feel not responsive enough

you do sanity checks on server when you get the client's trace result

[twilit radish]

The problem in this case is that the client sees a different view of the world than the server or yet another client does because of latency. What happens is that while a character on your screen seems like it's in a certain position it may have already moved on the server and hasn't been changed on that client yet. So if you shoot at a target on your client and the server does the same thing whenever the 'shoot packet' arrives the server may say that the shot missed because the target mean while moved.

how can i trust client traces tho?
If this is a Player vs. Player game then the answer is you can't. The client could obviously could just say "I hit this person!" while maybe being miles away. A solution to that is for example rewinding characters/physic objects etc. to compensate for the latency, but I must say I've heard people having a lot of issues with this because of the way Unreal's physics engine works. Although I'm pretty curious how that is now in UE5 because of the "async physics tick" system. But regardless it's still quite the setup.

What I believe Zlo said is the more common way. To do sanity checks, e.g. "is the character behind a wall when it was shot?" or "was the shooter facing roughly the direction of the target?" etc. but this obviously still has the issue that not all shots will be valid when they should have been. It's however a lot simpler.

A point someone else has brought up before which I couldn't agree more with is, first try to make your game actually feel good and if you can prevent cheats that's cool. But if no one plays your game and you spend all this time trying to make it cheat proof then there was no point in doing it in the first place.

If your game does grow big you can always hire people to fix these kind of issues or at least reduce them 😛

[lament garnet]

i totally understand the issue and i appreciate the detail explanation to begin with

this is a melee project so i guess making the "sanity checks" would be much easier

i also agree on the last part, people are going to cheat anyway and its not like i have a studio behind me to deal with it

[twilit radish]

For what my opinion from a random person on the internet is worth, I would not spend all the effort on trying to make it fully cheat proof and rather instead just do some sanity checks yeah 🙂

[lament garnet]

ill move everything client side then

ty

[twilit radish]

👍

[kind sequoia]

Hey guys, I recently got into unreal engine and I'm trying host a multiplayer game in aws. I haven't done this before, so I'm kinda skeptical.
Anyone tried dedicated servers before?

[silent valley]

Yes, many, many people have 🙂

You need to build engine from source, make a server package (I'd suggest Linux), and come up with a deployment method for getting the package onto a VM.
I use Packer to make an AMI that I create VM instances from.

Quite a lot of work, and that's only scratching the surface really.

And if you don't want to have to connect via IP address, you're going to need to setup an #online-subsystems too (e.g. Steam or EOS)

[unkempt tiger]

Do you mean like this? Because the server console still closes immediately upon erroring :/

[marble gazelle]

if you want to read the error and why it crashes, just open the logs files 😉 they are under Saved/Logs usually, named like your project and suffixed with a number IIRC, just check the recent logs and you get the pattern.

[fathom aspen]

This should prolly do the trick, though I launch using the commandline

[unkempt tiger]

I can't seem to find the Standalone Server's log, argh

[marble gazelle]

should be in the same folder as the editor logs

[unkempt tiger]

Scratch that, found it, that works!

[marble gazelle]

^^

[unkempt tiger]

Thanks for the help! 😍

[kind sequoia]

thanks mate!

[devout berry]

Hi all,

Not sure what I changed recently, but all of a sudden, when I PIE, the client does not spawn the pawn anymore that is set in the game mode. The server does of course and when I run two standalone experiences, they both work as well.

How can this be?

And I don't have any custom spawn logic. I literally mean the case of pressing play in a level where there is a game mode override with a pawn set

[undone galleon]

Hi Everyone, I am fairly new to Unreal and I created a modular character creator for a multi player game I am putting together. I have the character creator finished but I want set it up to save your character to a character section screen and when selected you can load him into the game. Is there any tutorials or documentation to do this?

[azure hull]

Hi, TopDown situation here. When I press movement for either Server or Client, I can see movement on both sides. The issue is when ever (after the Release tirgger) the Client character is supposed to stop at the end (finish movement to location), it does stop, but right at the end when it goes to the location, it jumps back for milisecond and then jumps back to the initial location. I think it's something related with Server forcing to move character to it's position but right at the end client finishes the movement? I did move MoveToHitLocation node after SR node, but the result is the same in both cases either if that node is executed before or after. I'm not sure what causes this.

[dark edge]

Ignore tutorials, but you need 2 things.

1. Some way to define your custom character data as a struct (the "recipe" for the custom character) with the corrosponding functions to go struct -> character and character -> struct

2. Save game, where you just save the struct to disk.

Once you have the struct definition of the character, it's trivial to also pass it over to the server so it has it and can build your character for you.

[undone galleon]

@dark edgeTrying to make multi player like a conan exiles dedicated server

[dark edge]

K well you'll at a minimum need to be able to save a players data, look up savegames.

[undone galleon]

@dark edgeYou got a link to a good one?

[dark edge]

With my name, you really think I'm gonna recommend any tutorial videos? Just read up on how save games work. It's just a wrapper for some structs that you can save to disk. You need to be able to condense all the info about a player (their inventory, their custom character data, whatever else) to some structs and just save/load them with the savegame system.

@undone galleonThis should get you started but make sure you understand what you're doing and not just following along.
https://www.youtube.com/watch?v=_4usRrTiqak

[undone galleon]

@dark edge👍

[still rampart]

I love HTF HTF/WTF IS explanations. Excellent content. Adriels suggestion to stop watching tutorials and actually understand the core concepts is something that should be repeated more often 🙂 I suggest following their advice

[pallid mesa]

☝️

[devout berry]

Is there a cvar or something to display current lag to the server I am connected to?

[dark edge]

There should be a ping on PlayerState or somewhere

[devout berry]

Thanks!

hm I think that is only working for server browser and such when iteration through found sessions

[dark edge]

Maybe it's on controller, it's somewhere

[devout berry]

'stat net' was the cvar I needed

[fallow shadow]

ok so im making an FPS as you might or might not know

so when you shoot that gets executed on the gameserver as well as on your client, and then the server looks for hits from the line trace, if it finds any it does everything tied to the "On Hit" event and then multicasts the "hit" back

is this the "right" way to do things?

[quartz iris]

Hi folks

[thin stratus]

That variable is for when you are connected.

It sits on the PlayerState class.

[thin stratus]

Yes and no. There are so many ways of doing this, that you could get away with it.
If the Shot happens on the Client too however, you might want to think about simply simulating it locally.
So basically strip all the authority based stuff from the code, like dealing damage, and keep the visuals like hit effects, so the client doesn't feel the lag of sending data back and forth.

[fallow shadow]

oh yeah quick correction the visuals are on the client but the line trace and hit detection itself is on the server

shouldnt be an issue because many games have some sort of small delay when firing but ill fix it later on if its an issue

[quartz iris]

I'm still trying to get a flashbang to effect both players but right now it only effects server and the clients don't even see the flashbang let alone the effect of the flash

I'm able to quickly stream whats happening with my code if that helps

[winged badger]

bool AActor::IsWithinNetRelevancyDistance(const FVector& SrcLocation) const
{
    return FVector::DistSquared(SrcLocation, GetActorLocation()) < NetCullDistanceSquared;
}```

so, yes

[glad escarp]

Assuming the path is correct for my GameMode, anyone know why this wouldn't work?

GetWorld()->ServerTravel(SelectedMapURL + "?listen?game=/Game/_BALLS/BPs/Game/GameModes/BP_Labtastrophe_GameMode_GAMEPLAY");

[dark edge]

Just show the code

[vocal cargo]

Is it possible to run a Client function on a Client that's also the Server? (Host-Client). I thought setting the function as "RunOnOwningClient" would fix this, but that doesn't seem to be the case

[bitter oriole]

Client = remote client

[vocal cargo]

But that would never run on my Client that's also the server, right?

I thought the Client that's also the Host would run two instances of the game, one as the Server and another as the Client, but that doesn't seem to be the case (?)

[kindred widget]

A Client function will be ran on the machine that is supposed to "own" the actor. If the server owns the actor and it's called on server, it will run on the server with no networking.

The server is the server. The server 'CAN' have a player as well. This is called Listenserver. Where one player is both a player and a game host. The other is called Dedicated Server. Where the server is a whole separate application. It can be ran on the same or a different machine than a player. The only difference is that the server itself becomes a whole different application.

[bitter oriole]

Client = remote client

So by definition not server

Listen server is a server

[kindred widget]

In this regard though, Client function is not aptly named to describe the issue. As, sure, a "Client" is a remote machine. But the client rpc will still call the function locally on the server, on the correct actor when it's called from "server" code, and the code will still technically run on the server, but on that player's version of the actor.

So it's really just easier to consider the client RPC as something that contacts an actor owned by a player instead.

[glad escarp]

Anyone have any idea why my arguments above in server travel won't work? I'm trying to load a new game mode when we travel from the lobby to the game.

%GetWorld()->ServerTravel(SelectedMapURL + "?listen?game=/Game/_BALLS/BPs/Game/GameModes/BP_Labtastrophe_GameMode_GAMEPLAY");

[thin stratus]

Hm you don't need the listen option

And maybe try to use the short codes for GameModes that you can set up in the maps and modes settings

You can give GameModes a unique key there

And then use ?game=Key

[glad escarp]

I think I figured it out. I reformatted it like this:

GetWorld()->ServerTravel(SelectedMapURL + "?listen" + "?game = / Game / _BALLS / BPs / Game / GameModes / BP_Labtastrophe_GameMode_GAMEPLAY.BP_Labtastrophe_GameMode_GAMEPLAY");

[thin stratus]

Again try to use the shortcodes

Removes the need of knowing the full path

[glad escarp]

I will do that. Taking a look now.

[thin stratus]

GameMode aliases or so

Can't remember that name

It's an array or map in the maps and modes project settings

[glad escarp]

Game Mode Class Aliases?

[thin stratus]

Yeah

[glad escarp]

So if I add an alias of "GameplayGM" my new format would be:

GetWorld()->ServerTravel(SelectedMapURL + "?listen" + "?game = GameplayGM");

?

[thin stratus]

Yes

[glad escarp]

cool. Tahnks. I'll give it a whirl

[thin stratus]

Just the listen is still redundant afaik

[glad escarp]

?listen inherent to severtravel?

[thin stratus]

I think it's only needed for the first hosting call

[glad escarp]

Ah. So when I create the lobby session, that's the only time I need ?listen

That argument will be persistent? I did set my sessions settings to allow JoinInProgress so I guess that'll work.

[glad escarp]

Thanks for the tips. The shortcode works and that's a nice thing to know for future reference. Cheers

[glossy crown]

Hey does anyone know what the best way to store replicated data is?

[chrome bay]

In what sense?

[dark edge]

As data.

I mean, what's the question here?

[glossy crown]

I've had issues with structure arrays, they don't replicate well so I was wondering if a data table is better

[dark edge]

A data table is just a table of structures, you don't replicate the table itself.

What specific mechanic are you trying to do?

[glossy crown]

I wanna replicate people's customized clothing

[dark edge]

Show your current data setup

[glossy crown]

the other part of it is on a widget

I didn't make it to replicate though

[dark edge]

Lose the Get Player Character too, just have some data on the pawn or their gear (depending on if gear is actors attached to actors or not) and repnotify on it

OnRep_PlayerGearData -> Apply it.

[dark edge]

What class is this in?

[glossy crown]

It's on the player state

[dark edge]

Player state can get to its own pawn, don't do Get Player Character 0.

Anyways, you want an onrep on some replicated data, whether that's an int, bool, enum, or struct

[glossy crown]

ok, thank you I'll see what I can do with this information

[sinful tree]

There is no reliable way to do this. If you are relying on any data coming from the client to tell the server something, the client can potentially spoof it.

Yes and no. No, because if someone figures out those random numbers (which can potentially be done via packet sniffing), they can intercept the packet with that version number, prevent it from going, and instead send the spoofed data.

Yes, if you expect no one to be malicious.

[thorny saddle]

Hello folks
if i have some actor with bNetLoadOnClient = false;
and this actor call some multicast function on another actor with bNetLoadOnClient = true;

second actor run that function on both side(Client and Server)?

[grizzled stirrup]

I believe the ?listen part is separate from creating the session and you just need to open a map with that param before sessions will work properly

For my game, I load into an empty map and instantly open a level with ?listen and then create a session

[thorny saddle]

    UFUNCTION(NetMulticast, Reliable)
    void Debug(const FString& Text);

void APCSAICharacter::BeginPlay()
{
    Super::BeginPlay();
    if (HasAuthority())
        Debug(TEXT("test"));
}

void APCSAICharacter::Debug_Implementation(const FString& Text)
{
    // Debug
    UE_LOG(LogTemp, Warning, TEXT("%d"), HasAuthority())
    const FString Str = TextRender->Text.ToString() + "<br>" + Text;
    TextRender->SetText(FText::FromString(Str));
}

why this not work in client side ?

TextRender is work ok in server

but nothing in client

[glad escarp]

Ok. So redundant or not, I'm just gonna keep ?listen. It doesn't cost anything

[grizzled stirrup]

Yeah it likely won't hurt!

[lament garnet]

i think you are only calling debug if the actor has authority

[thorny saddle]

yes but debug func is multicast

[twilit radish]

Are you sure the actor is replicated down to the client when you call this? I would find it unlikely that this works before it’s replicated.

[thorny saddle]

    UFUNCTION(NetMulticast, Reliable)
    void Debug(const FString& Text);

[lament garnet]

yeah is the replicate checkbox ticked?

[thorny saddle]

yes

[twilit radish]

Not necessarily the checkbox rather the time it takes, an actor isn’t magically instantly created on a client the moment you spawn it on the server.

Considering that you call this in BeginPlay on probably the server I would imagine it didn’t get the chance to do anything yet.

[thorny saddle]

so what should i do ?

i replicate this TextRender

but no fix at all

im so confused

[chrome bay]

Should be a replicated property, not a multicast

It's a stateful change

State = Replicated Property

[thorny saddle]

    UPROPERTY(VisibleDefaultsOnly , Replicated, Category="Components")
    UTextRenderComponent* TextRender;

[chrome bay]

Not that

The string

Replicating the component reference does nothing

[thorny saddle]

how can i replicate this then ?

[chrome bay]

You replicate a string property, and use it's RepNotify to update the text on the component

[thorny saddle]

i will try this now

[chrome bay]

any persistent change should be made via a property or you risk clients going out of sync with no way to know about it or solve it

[lament garnet]

does the rep notify allow for the previous value as an argument?

[chrome bay]

In C++ yes

In Blueprint no

[lament garnet]

i see

[chrome bay]

But if you're making an MP game in Blueprint you're already missing all your limbs

[lament garnet]

we live in a weird moment..i wouldnt say that

moment/period, not sure

[chrome bay]

What I mean is, BP makes life more difficult and has fewer tools

[lament garnet]

yeah i understand

[graceful flame]

Isn't Fortnite something like 80% blueprint and 20% c++?

[chrome bay]

Fortnite is 80% GAS which is heavily subsidised by complex C++

[graceful flame]

Well its all c++ under the hood

The way I see it, blueprint is faster for development iterations and allows you to quickly play test and adjust as needed, but eventually you'll probably want to convert most if not all of your game over to c++ for better performance and other benefits.

[kindred widget]

Looking for a general refresher. Normal TArray supports delta serialization usually? As in if you have an array of structs like an FVector for instance and change Z, then X and Y are not also sent, just Z?

As far as I know FastArrays can't do this, If Z is changed, the entire struct is sent.

[chrome bay]

Both TArray and FastArray support deltas

FastArray has it enabled by default in 5.0

[kindred widget]

Oh, that is convenient. 😄 Is there anything I need to do past specifying the structs and using them by marking them dirty like normal?

[chrome bay]

Nope just the usual setup 🙂

It is optional in case it causes any issues, but it seems to be pretty safe now. I suspect the packets are a bit larger than with TArray though

[fluid summit]

Hi everybody! i'm trying to change where i put variables and i'm trying to use more "GameState" for certain things, like what Controllers are on the game at the moment.

Is it okey to say that all the variables (even custom ones) by default are replicated on game state?.

[latent heart]

When you say controllers...

You can't say all variables are replicated, you have to mark each one as replicated or not.

[graceful flame]

If a replicated boolean is set to true and some server event fires that attempts to set it to true, does anything get sent over the network?

I have a few different events that can all set the same boolean to true, but if the bool is already true nothing happens...right?

[latent heart]

Depends what that srever event is

If the boolean is already true, it will be set to true again on the server (So if you have a setter method, this will run again)

But only changes will be replicated.

[graceful flame]

Okay so the setter method is still processed by the server, but only changes are sent over the network?

So its kind of wasteful to do things like that right?

[latent heart]

Wasteful, sure?

[fluid summit]

Yap, i tought they were all replicated by default on the game state, my bad. The game state lives on both client and server

[latent heart]

That is correct.... when you say controllers, what do you mean?

[fathom aspen]

I think he mean players? You got the PlayerArray

[fluid summit]

The list of current connect player controlers

[latent heart]

Player controllers aren't replicated

[fluid summit]

From GM when a new player gets connected, i add that one to a replicated array of "controllers" on GS and from there to the PC and UI

[latent heart]

So an array of player controllers on the gamestate will just have the local player's one and the rest would be null I guess?

Unless you're the server.

[fathom aspen]

Yes it's literally the PlayerArray, but you need to GetOwner to get PC

[fluid summit]

Oh there's already an array for that?

i was making a new one

[latent heart]

Yes.

[fathom aspen]

No need

[latent heart]

PlayerArray for the player states.

[graceful flame]

its inherited

[latent heart]

Don't put things which you want replicated on player controllers, ptu them on player states

[fluid summit]

it's on the Game State, not on the PC.
From the GS i tell the PC to update the UI with a RPC on owning client

[latent heart]

Controllers should handle movement and stuff like that, not hold state information you want shared with other players.

[fluid summit]

yap, thanks for the data. i'm gonna change the custom array on gs for the default one

[latent heart]

However, just because the player has arrived on the server, doesn't mean the player state has been replicated to all the clients

A better way is YourPlayerStateClass->BeginPlay

And EndPlay

[fluid summit]

i was doing a little workaround to solve that issue, but it makes more sense to control it on the player state if i already have a replicated array of players

gonna try with that, seems more simple

to use "Get player controller (0)" From any Player State is okey or should i use "get owner" and cast to controller?

[latent heart]

If you're using it on the server from any player state, get owner is probalby the better idea.

There's a chance that a listen server will fail somehow.

[fathom aspen]

On dedicated I think it fails not listen

[latent heart]

Well, if it's for UI updates, then Get Player Controller(0) for UI stuff will cause you to do the wrong thing for a listen server.

But it won't matter on a dedicated srever, there is no UI

[fathom aspen]

I see, was not following up on the purpose. But anyways it's discouraged as hell

[fluid summit]

so it will fail with getcontroller for the purpose of update UI

better just call get owner, cast and do rpc owning client for ui

[latent heart]

You could run the RPC just directly on the player state.

You don't need to use the controller.

[fluid summit]

The RPC is for the controller

[latent heart]

..okay..!

[fluid summit]

the flow would be.
Ps BeginPlay (authority) -> RPC on Client to Owner

does that make sense or would you recommend other way?

[latent heart]

Why the authority check? It's not needed.

Whenever any PS is fully replicated (and begin play is called,) the client it was replicated for needs to call RefreshPlayerList.

Ther'es no need to go through an array.

Or use RPCs

Player joins -> Player state is created on server -> Server calls begin play -> refreshes local player list ui on srever (or not if it's dedicated) -> player state is replicated -> client calls begin play -> refreshes local player list ui on client

That client part will happen on each client

[fathom aspen]

Though this logic will collapse sooner or later, as the list isn't being updated real-time

[latent heart]

How will it collapse? It's always accurate per client

[fathom aspen]

I mean, say a client logs out, you still have him on the list

[latent heart]

No.

That's why you also use the EndPlay event.

[fluid summit]

isn't player state, like player controller. Started both on server and client? without the check it would make the call twice if that's the case

[latent heart]

That's the idea.

[fluid summit]

you are right that i can remove the array, i can get that info on the PC

[latent heart]

Begin play will be called once on each instance (server/client)

That already happens, you don't need to use rpcs at all.

[fluid summit]

oh get it now

[latent heart]

This should be your BP

End Play*

In fact

[fluid summit]

since it's UI only, maybe just run on Remote of PS?

[latent heart]

Better

Then you will break your listen servers.

There is a function specifier that will make it not run on dedicated servers. I don't know if it's accessible via BP.

[fathom aspen]

BPCosmetic right?

[latent heart]

That's the one.

[fluid summit]

that makes sense, remote won't trigger on listen.

[latent heart]

Mark the UI update function as cosmetic and your logic is done.

[fluid summit]

I'm fully BluePrint at the moment

is that c++ or bp?

[latent heart]

Checks if it's in BP

[fathom aspen]

Seems like cpp only

[fluid summit]

Only info i could find, not sure if it's this one

https://docs.unrealengine.com/4.27/en-US/API/Runtime/Engine/Engine/FBlueprintMacroCosmeticInfo/

[fathom aspen]

Has nothing to do, no

Goes and submits a PR

[latent heart]

https://benui.ca/unreal/ufunction/#blueprintcosmetic

Is all the documentation you need on specifiers.

[fluid summit]

Just in case, this won't work.
only the new one is updated. The one that work is.

[latent heart]

When I did Update UI - I assumed this update the entire UI, not just the UI for a particular player

But glad it works!

Consider this situation, though.

There are 3 players. a 4th joins. A 4th player now pops up on the UI. This player leaves. Now, there are 3 players in the player array. The 4th player's UI won't be touched.

That is IF the player state is removed from the players array before endplay is called.

It might not be.

[fluid summit]

that makes sense, but it doesn't matter in this case, if the player leaves, the changes on the UI should be handled by the Change of level

But i'll keep that in mind for later

Like a charm, thank you

also it's way more simple this way

[latent heart]

Np

[daring gorge]

how would i go on about creating a widget for another client? and that client only.

[stiff topaz]

Some One can help me please! I need to know how best practice about replicate animation in top down character with cursor?

I need tick for this or another way to success?

[woeful ferry]

How do I know if a actor is spawned by a client? Not requested by client, but spawned in client world

Since client has authority over that actor, HasAuthority wont work

[undone python]

Hi, Sorry, maybe a stupid question)
what is the basis for choosing a character revival technique? Usually a character is destroyed and then a new one is created and the Player Controller is put into it. But you can also fake kill a character and then just move it to a respawn point. I want to know why this or that way is worse or better? Thanks in advance

upd:
I think the main reason - the state. Maybe the character had some additional parameters that need to be reset, or he was registered in some systems (for example, AI enemies always know about the character) and so on. Sometimes it's easier (but not necessarily cheaper) to just kill a Persian and create a new one, with clean state and you can be sure he's pristine, properly registered in other systems, etc. If you do not want to destroy, to create - need to prescribe Reset logic everywhere. If it's just to put Idle animation and change the position nat the point of resurrection - go for it. But often you need to "clean" a lot more places.
But I could be wrong.

[winged badger]

Generally, its not better or worse either way

One tends to be a better fit for your specific game

[chrome bay]

HasAuthority() && IsNetMode == NM_Client

[woeful ferry]

Thanks! 😄

[zinc light]

hi all, anyone can tell me, on top of his head, why my client side character moves like he's on thin ice, and doesn't stop moving when i stop the input? it behaves like a stuck throttle rather than an on-off input on press. It was working perfectly right before i changed skeleton

[azure hull]

Does EnhancedInput have a support for Multiplayer? Because of the "Enhanced Input Local Player Subsystem" context, I'm wondering about that.

[chrome bay]

Input has nothing to do with multiplayer

So in a sense, yes

[uncut schooner]

Hi

How is everyone

I remember using a variable that had replicated rotation, Was there one or am I misremembering?

[near bison]

Has anyone used listen servers for a mobile game in production?

[bitter oriole]

That seems like a particularly horribly bad idea

[near bison]

Why

[bitter oriole]

Because it takes one user passing under a bridge

To literally kick the entire game

[uncut schooner]

But minecraft?

...

[bitter oriole]

So in real-world conditions it wouldn't work at all

[uncut schooner]

Its not unreal but it has a listen server

[near bison]

"passing under a bridge"? Sorry didn't understand

[uncut schooner]

Amongst many other mobile games?

[near bison]

Isn't Among Us also doing listen servers?

[uncut schooner]

Yes

[bitter oriole]

Say you walk under a bridge and lose networking for a second or two - under Unreal's net model every players get kicked out

[uncut schooner]

... /:

[bitter oriole]

Since mobile is normally not on Wifi 100% of the time

[uncut schooner]

True but probs not the problem

[near bison]

ok...was just considering because dedicated servers are insanely expensive I'm assuming, for a small mobile game

[uncut schooner]

Base Aim Rotation

[near bison]

And unreal doesn't let me play multiple matches in one server process

[bitter oriole]

Other problems with this approach include unpredictable performance (like maybe 10x the CPU load), higher battery usage, and generally poor connectivity leading to a bad experience

Most mobile games aren't fast-paced action, too, so I figure a vast majority runs on Web servers without any of the client's game engine

Your average mobile game is extremely asynchronous with little real-time player interaction

[near bison]

True. Mine's a board game

Looks more and more like i have to switch to using websockets

[bitter oriole]

We've had this discussion before I think but yes I would certainly suggest something like that

[near bison]

Yeah I'm just ruling out all options

SocketIO client for unreal doesn't look promising. They don't have SSL support

[bitter oriole]

I think Minecraft has dedicated servers, too, just like Among Us, AFAIK : https://github.com/Impostor/Impostor

[bitter oriole]

Unreal should normally have full websocket support with HTTPS

[near bison]

Wait among us is dedicated servers?

[uncut schooner]

For local matches its not

For both games

[bitter oriole]

Yeah

[near bison]

how are they offsetting the insane costs? Any hunches?

[near bison]

What is local match

[uncut schooner]

Local, so lets say we all connected to the same network at a house and play together

[near bison]

That's not possible to know before hand

[bitter oriole]

Just like every other game developer - you have to ensure enough people buy the game and the average playtime x cost per hour doesn't get too absurd.

For Among Us I'm not sure it's an Unreal dedicated

So that could make the servers way cheaper

[near bison]

Yeah it's unity

[bitter oriole]

Yeah I meant Unity - I mean I think they have their own server

[near bison]

Well since you have experience, how much RAM does an Unreal headless server usually eat up? Bare bones.. any benchmarks?

[near bison]

They're using darkrift, it's an open source library

But i didn't think they'd be dedicated, because one of the devs did mention they use a relay

[near bison]

Any thoughts? My VM is 2gb,
If the unreal headless build for this game is like 100mb per process, I'm gonna have to start thinking about migrating to websockets next week lol

[bitter oriole]

Empty, probably a few hundred MBs, but that doesn't help you much. Depends on the game, and if you have a reasonable path to avoid it, just avoid it.

[near bison]

A few 100?!?!!!

Here i was, optimistic as I am, thinking i can bring it down to 10mb through some voodoo magicb 🤣🤣🤣🤣🤣

[bitter oriole]

An Unreal game executable alone is about 100MB so obviously that's a baseline

[near bison]

Why is this not common knowledge?damn, i don't find this info online anywhere

[bitter oriole]

I'd plan for say 4GB per instance with the expectation to be able to drop to 2GB per instance but it's sooooooo game dependent it's a pointless random guess

It literally 99% depends on your game

[near bison]

Baseline 100mb is insanely bad for a mobile game
My day job our unity headless server for a game with a lot of stuff going on (movement, animations, 100s of CCU) is like 60mb
30-35***mb when it's got 2-3 CCU

I may be exaggerating the 60mb, but the base unity + a few CCU is definitely in that range

Actually lemem check rn

[bitter oriole]

"Hundreds of users" is definitely not something you'll see for an Unreal server

Again, Unreal MP is meant for fast-paced action titles with server-authoritative gameplay

Say Unreal, Fortnite, etc.

[near bison]

ok our unity server with 0 players connected is 60mb. Tbf there's a lot going on though

60mb is still a lot

Now 100mb doesn't look that bad

But unity also allows me to run multiple games on 1 server process, so there's that

So it's more like 5-10 games distributed on 1 server. So it's actually 6-10mb per match going on. Which is extremely reasonable.
That's like...200 games on 1VM

800CCU for $30-40 a month

[bitter oriole]

Websocket, your own server.

[near bison]

with ws I can do like 1000+ ccu for like $10-20 a month

[near bison]

one question, do you know anybody (or have you) built a ws game with unreal client in production for mobile?

[bitter oriole]

No, I don't know anyone working with Unreal on mobile. It's not exactly a great fit in the first place

[near bison]

unless it's top heavy (I assume)

[bitter oriole]

Frankly if you're making a game from scratch that's gonna be mobile exclusive it's hard to shake the idea that Unity might be a simpler choice

[near bison]

yeah only problem is we are 95% of the way through

and also I now understand crsytal clear now why unreal is not suitable for indie devs...

even if we were to go through toil to do websockets + unreal client, I'm still scared because it sounds like Unreal clients are also super heavy

and websockets....we'll have to reinvent the wheel with how replication handles everything for us currently

constantly sending messages back and forth, an entirely new API. It would be easier to just rewrite in Unity imo

[bitter oriole]

I mean Unreal is incredibly good for indies, imho. That Unreal isn't good for networked mobile games is hardly an unpopular notion

[near bison]

yeah maybe I'm jumping the gun here. I guess a lot of games are singleplayer

[bitter oriole]

Multiplayer in Unreal is arguably a much better experience than Unity if you're doing something the engine is good at

[near bison]

i agree. i've used both a lot. no question there. that's why we wanted unreal in the first place

[charred pebble]

Heyo folks - I'm setting up a game server currently and seeking to stack users in a single instance - what I believe I'm looking for is to create a repeater, but having trouble sourcing information around the topic, does anyone have any links on hand by chance?

[twin juniper]

I'm trying to learn networking, how do I actually talk to a client as a server?
I want to issue a command where I print his display name

[lament garnet]

you can call methods on the client if you are on the server with UFUNCTION(Client)

[twin juniper]

I'm using blueprints for now for testing things out+

[lament garnet]

if you make a custom event on the top right you can set where the event should execute

it should be OwningClient or smth like that

[twin juniper]

Basically I have 3 pawns in the world and three clients (one as listen server, two as normal clients) and I'm trying on begin play to give a pawn to each client

Issue is the PlayerController is server-sided

[lament garnet]

you have to do that in the gamemode which only exist on the server too

by using the onpostloginevent (i think)

the event has as parameter the player controller for the character joining but it require some setup

i suggest watching tutorials if you are completely clueless

[twin juniper]

The server owns a player controller itself as well

[lament garnet]

yes

when another player join, a new player controller is created and assigned to the new player

[twin juniper]

Fine, but how do I actually distinguish between the server and the client?

Every command I issue on either the gamemode or the player controller is always fired by the server

So I can't really address that particular client it seems

[lament garnet]

through the player state that also exist on the client and is accessible throrugh the playrr controller

[quasi tide]

People who regurgitate this line of thinking are thinking of UE in like 2014 or something. It is ridiculously good for indies.

[twin juniper]

if I cast the playerstate I use in the gamemode and call a custom event there I still get that the server is doing it three times

Rather than the clients

but if I set it to "run on owning client only" I get it correctly but it is still replicated?

[near bison]

no. because a lot of indies are building mobile games, especially mp, because money is there. and unreal is seemingly bad for that

[quasi tide]

And a lot are not building mobile games.

[near bison]

i don't want to argue about this, we stem from different regions

I come from india, where 97% of population games on mobile
feel free to read this if you doubt what I'm saying:
https://blume.vc/understanding-india-the-indus-valley-annual-report-2022/

most of us are privileged who are building for PC markets and playing PC games, that's not the case in 90% of the world

[lament garnet]

what is replicated?

[twin juniper]

It's a simple print string

Nevermind that I figured it out

[quasi tide]

I'm not doubting what you are saying in the slightest. But "a lot" isn't very useful of a metric. Because it can be true in both statements.

[near bison]

that's fair

[quasi tide]

Know your target audience, choose the right tool for the job. Doesn't mean that a particular tool is not good for a particular demographic.

It's just not suited for that job.

[twin juniper]

The player controller is always replicated isn't it?

[lament garnet]

the player controller only exists on the server, it is NOT replicated

[near bison]

that's true. ultimately it's my bad, cause I chose unreal for a small mobile board game

[twin juniper]

Like, here's what I'm not getting: I have a player controller class with a custom event that just prints a string. If I set this event to "not replicated" then I see in the top right "Server: " printing that string three times (I have three clients, one listen server + 2 normal clients) - HOWEVER if I set the event to "replicate on owning client" I see Server: then Client1: and then Client2: strings

[raw thunder]

No the player controller exists on client as well! How would you send the input otherwise?

[twin juniper]

But those three strings are always synchronized between every client, I see them all in every client

I assume that "run only on owning client" meant that if the event is fired on the client it would not get replicated to the other clients

I can show you a quick video if that helps you

[quasi tide]

Run on owning client does the RPC to whoever owns the object.

[twin juniper]

Thanks for all the help

[raw thunder]

I suggest you to take a look at some pinned messages, you can look at eXi compendium to start :)

[twin juniper]

so when I set it to "not replicated" the server just calls that function x amount of times based on the number of clients?

[lament garnet]

what?

[quasi tide]

No - Run on Client doesn't run on a per client basis. It's a way for the server to do an RPC call to a specific client.

[quasi tide]

Player controller exists on the server and the single owning client. That's what they are saying.

Client will have 1 player controller, server would have X amount.

[raw thunder]

The player controller exists on the server and client and is owned by the client

[lament garnet]

oh okay i was just getting confused i gurss, im sorry

[raw thunder]

But other clients don't see other PC

Only their own, the server sees every one of them

[lament garnet]

yeah that is what i was trying to say

i did with bad words

[twin juniper]

I still don't get how am I supposed to address the server's player state

monkey brain hurts

[raw thunder]

You want to send a message from the server to one of the clients right?

[twin juniper]

No, the opposite

[dark edge]

run on server event

[twin juniper]

I'm having a stroke

[raw thunder]

You want from a client send a message to the server?

[twin juniper]

How do you get the client name on the pawn itself?

From the player controler

The pawn is being possessed by a player controller, how do I get the client name from that player controller?

[raw thunder]

I'm not sure what you mean by name, do you have a variable with the client name on your pawn?

[magic yoke]

I'm currently running the game in "Client mode". I have a feature that is, as far as I could see, solely client side because I have branches "is dedicated server? false do something"

However my code is coming back saying it's being run on a server, not on a dedicated server. Which makes no sense to me, I'm not using listening servers in the dropdown run mode

[daring gorge]

so i need the same kinda thing to do, basically whenever i kill someone i show a notification on the player who killed and the notification should contain the name of the victim, im getting the widget to spawn but the name is always of the server, can anyone tell how i can fix this?

im using an interface message that has the controller creating a widget on multicast

and if the owner controller matches the controller then it should spawn the widget

[raw thunder]

The client mode is using a listen server in the background I think, if you want to use a dedicated server you need to specify if somewhere.

[twin juniper]

I meant DESKTOP-389423872394 that thing

[magic yoke]

that's pretty silly

[twin juniper]

There was 3 different ones one for each client

[magic yoke]

thanks though

I was trying to make both dedicated/non-dedicated servers possible

[daring gorge]

does anyone know whats wrong here

[raw thunder]

You have a is server node

(dedicated and not dedicated)

[magic yoke]

there are some things that need to be on a listen server but not on a dedicated server

which is why I have is server and is dedicated server branches

[scenic ruin]

Even for a BP project, is it a wise idea to define mostly all variables in c++, just in-case they get used in code for whatever reason?

[sinful tree]

I think playerstate already contains the variable that would have that value.

[raw thunder]

Yeah so if is server but not is dedicated server

[magic yoke]

ok but the issue is, I can't get my program to launch as an actual dedicated server

so those branches don't work

any idea where?

I checked the settings and don't see it

unless it's a launch option thing

[daring gorge]

any idea about this :/

[magic yoke]

the playerstate thing datura said

[raw thunder]

It should be in the settings, sorry not at home so I can't help right now

[daring gorge]

tried, im using the player controller to get player name since the one spawning the widget is the victim

[raw thunder]

Which unreal version are you using?

[magic yoke]

hm, will keep looking I guess

5.0.2

[sinful tree]

You can't use player controllers to get player names as the player controllers are not replicated to all clients.

[daring gorge]

oh i see i see, in online subsytem do player states have the same name as the steam name?

[twin juniper]

so how do I get my own player name locally?

[sinful tree]

If you know the pawn then you can get the playerstate from the pawn.

[twin juniper]

without calling the player controller

[daring gorge]

theres a get player state node

you can use that and cast to your player state

[sinful tree]

For an example, this "Player State" variable exists within all pawns, so I can use that to pull the player name.

[daring gorge]

. this though

[uncut schooner]

Hey guys

Is there any way to validate weapon spread

Or is that a pipe dream even If I made it deterministic?

[daring gorge]

wow the player state node really worked

[magic yoke]

so you want client side hit detection with server side verification?

[uncut schooner]

Yeah

[dark edge]

Yeah, same random stream or seed or whatever.

[uncut schooner]

I get that, but how do I validate a shots rotation, accurately, I guess I could check on the server by recording the control/ cam rotations, then when I fire locally, check the history to make sure its correct but wouldn't bad network cause invalidations where there is valid data>?

[magic yoke]

do you know how to force the editor to actually launch a dedicated server?

launching "client" seems to launch a listening server still

[lament garnet]

should launch a background deducated server not a listening server

[magic yoke]

that's not happening

[dark edge]

I test with launching, not pie. But it shouldn't matter. If you set stuff up correctly, you should be able to play standalone, listen server, dedicated server, without changing anything

[magic yoke]

yeah I'm using out of the box "client mode" on the editor

and it's not launching a dedicated server apparently

[twin juniper]

How do we launch a separate dedicated server?

[sinful tree]

If you have multiple copies of your project open, it can bug out the dedicated server networking setup - make sure you only have one open.

[magic yoke]

I only have one

[raw thunder]

In fact I just read the unreal documentation and on UE5 it should spawn a dedicated server in client mode

[twin juniper]

I can't breathe

[quasi tide]

Launch it in standalone mode. PIE can be funky.

[magic yoke]

that was my understanding, I haven't modified anything

and my settings say it should launch dedicated

which is why I'm confused

[raw thunder]

In previous versions you had the check the dedicated checkbox but now it does not seems to be the case

[uncut schooner]

How do you validate this though, because right now I use a check to see if the clients camera is in the right direction

So anything within like 50% of the screen could pass

[raw thunder]

You could re-run your test on the server with an RPC and send back a confirmation to the client with another RPC, if it is true do your effect. (Prediction is quite a hard topic so this would be with prediction on client)

[uncut schooner]

Yeah on the server it does a test to see if your angle between cam forward and client 'reported' forward is in 45 degrees

After some testing

[quartz iris]

Hello